MLRA(s): 270 MLRA Soil Survey Regional Office (SSRO) Responsible: Raleigh, North Carolina Depth Class: Very deep Drainage Class: Well drained Saturated Hydraulic Conductivity: Moderately high or high Parent Material: Residuum from Hato Puerco lava formation. Slope: 5 to 60 percent Mean Annual Air Temperature: 16 to 21 degrees C. (61 to 70 degrees F.) Mean Annual Precipitation: 3,556 to 5,436 millimeters (140-214 inches) TAXONOMIC CLASS: Very-fine, kaolinitic, isothermic Humic Haploperox TYPICAL PEDON: Los Guineos clay - Palo Colorado forest in El Yunque National Forest. (Colors are for moist conditions.) A--0 to 3 centimeters (0 to 1 inch); dark yellowish brown (10YR 4/4) clay; moderate fine and medium granular structure; friable; moderate sticky, moderate plastic; many continuous faint organic stains on all faces of peds; common very fine and fine roots throughout; few fine tubular pores throughout; extremely acid; clear smooth boundary. (3 to 13 centimeters (1 to 5 inches thick)). AB--3 to 8 centimeters (1 to 3 inches); yellowish brown (10YR 5/4) clay; moderate fine subangular blocky structure; friable; very sticky, very plastic; few fine cylindrical worm casts on faces of peds; few fine continuous faint clay films on all faces of peds; common fine and medium continuous distinct clay films on all faces of peds; common fine and medium roots throughout; common very fine tubular pores throughout; extremely acid; clear smooth boundary. Bto1--8 to 23 centimeters (3 to 9 inches); yellowish brown (10YR 5/6) clay; moderate medium and coarse subangular blocky structure; firm; very sticky, very plastic; few fine cylindrical worm casts on faces of peds; many continuous distinct clay films on all faces of peds; common fine and medium roots throughout; common fine and medium tubular pores throughout; extremely acid; clear smooth boundary. Bto2--23 to 46 centimeters (9 to 18) inches; brownish yellow (10YR 6/6) clay; moderate coarse subangular blocky structure; firm; very sticky, very plastic; common fine prominent red (2.5YR 4/6) masses of iron accumulation on faces of peds; few fine cylindrical worm casts on faces of peds; many continuous distinct clay films on all faces of peds; common fine and medium roots throughout; few fine tubular pores throughout; extremely acid; clear wavy boundary. Bto3--46 to 79 centimeters (18 to 31 inches); red (2.5YR 4/6) clay; moderate medium and coarse subangular blocky structure; firm; very sticky, very plastic; many coarse prominent yellowish brown (10YR 5/6) masses of iron accumulation on faces of peds; few fine cylindrical worm casts on faces of peds; many continuous distinct clay films on all faces of peds; few fine roots throughout; few medium tubular pores throughout; very strongly acid; gradual smooth boundary. (Combined thickness of the Bto horizons range from 64 to 127 centimeters, 25 to 50 inches) Bt1--79 to 109 centimeters (31 to 43 inches); red (2.5YR 4/6) silty clay; weak coarse subangular blocky structure; firm; very sticky; very plastic; common medium distinct yellowish brown (10YR 5/6) masses of iron accumulation on faces of peds; few distinct clay films on all faces of peds; few fine roots throughout; few medium tubular pores throughout; very strongly acid; gradual smooth boundary. Bt2--109 to 155 centimeters (43 to 61 inches); strong brown (7.5YR 5/6) silty clay loam; weak very coarse subangular blocky structure; firm; moderate sticky, moderate plastic; many medium distinct yellowish red (5YR 4/6) and few medium distinct yellowish brown (10YR 5/6) masses of iron accumulation on faces of peds; common faint clay films on vertical faces of peds; few fine roots throughout; few medium tubular pores throughout; very strongly acid; clear smooth boundary. (Combined thickness of the Bt horizons range from 38 to 102 centimeters, 15 to 40 inches) BCt--155 to 203 centimeters (61 to 80 inches); strong brown (7.5YR 5/6) silt loam; weak very coarse subangular blocky structure; firm; moderate sticky, moderate plastic; many medium distinct yellowish red (5YR 4/6) masses of iron accumulation on faces of peds; few continuous distinct clay films on surfaces along root and pores channels; few medium tubular pores throughout; about 10 percent, by volume, highly weathered saprolite material; very strongly acid; gradual smooth boundary.